Viessmann Vitotronic 200 Installation And Service Instructions For Contractors page 105

Fault messages
(cont.)
Cause
Communication error, EA1 extension
D4 High limit safety cut-out, boiler
Boiler cools down.
Cause
The high limit safety cut-out or fuse F1 has blown.
D6 Fault message at digital input 1, EA1 extension
Control mode
Cause
Input DE1 at EA1 extension reports a fault.
D7 Fault message at digital input 2, EA1 extension
Control mode
Cause
Input DE2 at EA1 extension reports a fault.
D8 Fault message at digital input 3, EA1 extension
Control mode
Cause
Input DE3 at EA1 extension reports a fault.
DA Short circuit, room temperature sensor Vitotrol, HC 1
Control mode without room influence
Cause
Short circuit, room temperature sensor, heating circuit 1
without mixer
DB Short circuit, room temperature sensor Vitotrol, HC 2
Control mode without room influence
Cause
Short circuit, room temperature sensor, heating circuit 2 Check room temperature sensor: See chapter "Check
Measure
Check the connections: See chapter "EA1 extension"
■
Without EA1 extension:
■
Set parameter "40:0" in the "General" group.
Measure
Check the high limit safety cut-out, burner, burner loop
and fuse F1: See connection and wiring diagram
Measure
Remedy fault at appliance concerned.
Measure
Remedy fault at appliance concerned.
Measure
Remedy fault at appliance concerned.
Measure
Check room temperature sensor: See chapter "Check
temperature sensors"
Measure
temperature sensors"
Troubleshooting
105